CN102804111A - Coordinate input device and program - Google Patents

Abstract

Disclosed is a coordinate designation device-that can detect simultaneous operational input with respect to a plurality of coordinates-wherein the occurrence of mis-operation, including when inputting characters, is suppressed. The time elapsed from a preceding up operation to a new down operation is calculated, and when the calculated elapsed time is at or below a threshold, an input information event is launched at the detected coordinate of the down operation. Also, the distance moved from the input-start-time coordinate to the current coordinate is calculated, and when the calculated distance moved is at or above a threshold, an input start point event is launched at the input-start-time coordinate.

Description

Coordinate input device and program

technical field

The present invention relates to a coordinate input device arranged on the surface of a display screen or a projection screen. For example, it relates to a coordinate input device capable of simultaneously detecting coordinate input of a plurality of points on a display screen or a projected screen, and issuing an event corresponding to a combination of status information on the detected points, and a program thereof.

Background technique

Conventionally, devices that input operation inputs of fingers or electronic pens on operation screens generated by computers and other screen generation devices as a coordinate sequence have been put into practical use. Such a device is referred to as a coordinate input device in this specification.

Conventionally, there is an electronic tablet system as one of the devices to which the coordinate input device is applied. In the electronic tablet system, an event corresponding to the operation input detected by the coordinate input device is issued, and a character object or an image object (such as a line of various colors and thicknesses) reflecting the trajectory of the operation input can be drawn on the operation screen. constitute). In addition, in the electronic tablet system, through operation input on the operation screen, objects on the operation screen can be operated. In addition, in the electronic tablet system, an event directed to the computer system that cooperates with the operation screen may be issued by an operation input accompanied with a specific action. For example, through the issued events, it is also possible to cause the computer system to execute enlargement, reduction, deletion of graphics, and other commands.

Conventionally, among coordinate input devices used in electronic tablet systems, there is a coordinate input device capable of simultaneously detecting a plurality of operation input coordinates or the size of an object used for operation input. Among such coordinate input devices, there is a coordinate input device capable of obtaining operation input coordinates or the size of an input object by detecting a shadow of the input object.

However, in coordinate input devices using shadows, false detection may occur at the start of input. For example, when an input is started with the palm, if the size of the shadow is focused, the size of the shadow of the input object changes from the size of one finger to the size of the palm. Therefore, the input is sometimes mistaken for input by 1 finger, although it is actually the input by the palm.

Therefore, in order to solve this problem, it is necessary to store a plurality of information related to state information such as the size of the object detected at the beginning of the input and the number of input parts in the storage area in the screen generation device, and to confirm the transition of a series of states. A method to prevent the occurrence of misuse.

prior art literature

patent documents

Patent Document 1: JP-A-2009-86886

Contents of the invention

The problem to be solved by the invention

However, the erroneous operation prevention method described in Patent Document 1 also has problems. For example, the detection of the operation input ends when the number of times is less than the threshold value set as the number of times of detection. In this case, a click event, which is an input with a high frequency in the history information, is issued for the detected operation input.

However, in the case of rapid operation input such as operation input when writing characters, when the number of detections between the start of input and the end of input is less than the threshold, or the number of detection points corresponding to the input stroke is small Next, it is executed as a succession of click actions or strokes that are shorter than the user wants the line to be. In this case, line input of characters may not be correctly reflected in the drawing on the operation screen.

The present invention has been proposed in consideration of the above problems, and its object is to provide a case where an event corresponding to a combination of state information on detected points is issued in a coordinate input device capable of simultaneously detecting coordinate inputs of a plurality of points. Next, it is possible to suppress or improve the technology of occurrence of erroneous input.

means to solve the problem

Therefore, in the present invention, there is provided a coordinate input device or an executed program having: a process (means) for detecting information related to an operation input to a displayed or projected operation screen; The processing (unit) of the elapsed time from the operation of the object in the direction away from the operation screen (input end operation) to the new descending operation (input operation in the direction of the object approaching the operation screen (input start operation)); When the time is below the threshold, the processing (unit) of an event that issues input information at the detection coordinates of the down operation. In addition, in the present invention, there is provided a coordinate input device or a program executed, which includes: a process (means) for detecting the coordinates of an operation position of an input object on a displayed or projected operation screen; and a data group of the detected coordinates as Processing (unit) of storing object data in the storage area; processing of calculating the movement distance from the coordinates at the start of input to the current coordinates; when the calculated movement distance is more than a threshold value, detection of coordinates at the start of input Issuing input The processing (unit) of the event at the start point.

The effect of the invention

According to the present invention, even in the case of quickly inputting strokes such as characters, it is possible to accurately grasp the starting point of writing or the stroke during input. As a result, misjudgment of operation input can be suppressed, and the user's character input can be accurately reflected in the drawing.

Description of drawings

FIG. 1 is a system configuration diagram showing an embodiment of the electronic tablet system of the present invention.

FIG. 2 is a diagram showing examples of input states detectable by the coordinate input device of the present invention.

FIG. 3 is a diagram showing an example of the structure of input data output from a coordinate input device.

FIG. 4 is a diagram showing an example of the relationship between the hand movement at the start of the input movement and the graph showing the change of the input data when input is performed with two fingers or the palm.

5 is a diagram showing detection coordinates when a line is drawn on the operation screen and an example of drawing when an input error occurs.

FIG. 6 is a diagram showing an example of input progress time and input standby time of each stroke during character input.

FIG. 7 is a diagram showing distribution examples of input points (detection points) during click input and line input.

FIG. 8 is a diagram showing an example of a functional block of the erroneous input prevention device.

Fig. 9 is a flowchart illustrating software processing of the erroneous input prevention device.

FIG. 10 is a diagram illustrating a connection relationship of electronic circuits constituting the coordinate input device.

Detailed ways

Embodiments of the invention will be described below with reference to the drawings. In addition, the embodiments described below are all examples, and the present invention also includes systems realized by combining arbitrary functions described in this specification, systems in which some functions described in this specification are replaced by known technologies, and systems described in this specification. A system in which known technologies are added to the described functions. In addition, the functions executed in the embodiments described later are realized as programs executed on a computer (computer). However, part or all of the program may also be realized by hardware.

(Structure of electronic tablet system)

An embodiment example of an electronic tablet system is shown in FIG. 1 . The electronic writing tablet system shown in FIG.

The electronic tablet 101 is a coordinate input device that detects operation coordinates of an input operation by a finger, a stylus pen (pointing stick), an input pen 102 , and other input objects. In the case of this embodiment, the electronic tablet 101 is a coordinate input device that uses light irradiated in parallel to the projection surface of the operation screen, and detects the position of an input object shielded from light by the principle of triangulation. The basic principles of such coordinate input devices are well known. For example, two light sources (such as infrared light sources) and image sensors (imaging devices) are arranged at both ends of the upper side of the frame shape or near the center of the upper side. For example, when two light sources are arranged at the left and right ends of the upper side, each light source emits light or scans the entire area of the side opposite to the side where it is placed and the entire area of the lower side. In this case, the image sensor has a field of view of approximately 90°. In addition, when the two light sources are arranged on the upper side near the center, the irradiation angle of each light source and the field of view angle of the image sensor are each set to approximately 180°.

On the three sides except the upper side, reproducible reflective members are arranged on the inner side of the frame (the surface facing the light). Therefore, incident light is reflected in the same direction as the incident direction. The reflected light is received by an image sensor disposed near the light source. Furthermore, in the case of such a coordinate input device, a plurality of coordinate inputs can be detected simultaneously.

In the case of the electronic tablet system shown in FIG. 1 , the electronic tablet 101 is arranged at a position in front of a screen or a whiteboard on which an operation screen is projected from the operation screen projection device 103 . That is, a detection surface for operation input is formed at a position on the front side of the screen or the whiteboard. In addition, in the case of this embodiment, the operation screen is projected, but a configuration in which the electronic tablet 101 is integrally arranged on the surface of a display device such as a flat panel display is also conceivable. In addition, the input area 107 where the electronic tablet 101 is supposed to input the coordinates of an input object includes not only a large-area area such as an imaginary screen or a whiteboard, but also a small-area area such as a display screen of a mobile phone, an electronic book, or other portable terminals. .

FIG. 10 shows the connection relationship of the electronic circuits constituting the electronic tablet 101 . The image sensors 1001 and 1002 are driven by a drive circuit 1003 , and the operation of the drive circuit 1003 is controlled by a CPU 1006 . The drive circuit 1003 provides the acquisition timing of the screens of the left and right image sensors 101 and 1002 . The image signals output from the image sensors 1001 and 1002 are amplified by the amplifier 1004 and then input to an analog/digital conversion circuit (A/D) 1005 to be converted into a digital signal format.

The CPU 1006 detects the number, coordinate position, size, etc. of the input object based on the position information of the shadow of the input object appearing in the imaging data corresponding to the left and right image sensors 1001 and 1002, and generates a packet having a data structure described later. data. The generated packet data is output to the control computer 104 through the interface USB1007 and the USB cable. 10 assumes that the light source always emits light, but it is also possible to switch the infrared light emission timing by connecting the light source to an unillustrated drive circuit controlled by the CPU 1006 when it is necessary to control the light emission timing of the light source.

The operation screen projecting device 103 is used for projecting an operation screen or text or objects input through an input object on a screen or a whiteboard.

The control computer 104 has functions equivalent to those of a general-purpose personal computer, and stores a display content control program 1041 for processing character objects or image objects in an internal memory. In addition, the control computer 104 detects an operation input based on an input object, and also executes an event generation process corresponding to the detected state.

In the case of this embodiment, the display content control program 1041 executes event generation processing, and as part of its function, executes a program for preventing erroneous input proposed by the inventor. However, the functions corresponding to this program may be executed in the electronic tablet 101 or installed in the operation screen projection device 103 . This function may be implemented in the form of hardware (eg, semiconductor integrated circuit, processing board) or in the form of a program (eg, firmware, application program).

(detectable operational input)

FIG. 2 shows an example of a state of an operation input detectable by the coordinate input device. In this system, it is possible to detect a point input state where only one finger or the electronic pen 102 touches the coordinate input surface (virtual surface) of the electronic tablet 101, and two fingers simultaneously touch the coordinate input surface (virtual surface) of the electronic tablet 101. ) in the 2-point input state, and the palm input state in which the entire palm touches the coordinate input surface (virtual surface) of the electronic tablet 101 . These states transition from one another according to the contact state of the hand with the coordinate input surface (virtual surface) of the electronic tablet 101 . Accordingly, input methods such as inputting a drawn line with one point, inputting a strikethrough with two points, and scrolling the screen with the palm can be differentiated and used according to the function.

Here, the detection surface is referred to as a virtual surface because the traveling surface of the light used for coordinate input by the electronic tablet 101 is different from a physically existing surface such as a screen surface, a whiteboard surface, or a display screen.

(output information of electronic tablet)

FIG. 3 shows an example of the data structure of information output from the electronic tablet 101 to the control computer 104 . Specifically, an example of a data structure corresponding to input data corresponding to one frame and input data corresponding to one input event is shown.

The input data 301 for one frame consists of the time 302 when an input object in the input area 107 was detected, the number of detected objects 303 , coordinate information 304 for each detected object, and detected object size information 305 . In the case of FIG. 3 , it is a configuration capable of handling n (2 or more) detected objects.

For example, when there is no object on the coordinate input surface, data (packet data example 306 ) consisting of the detection time when the detection is performed and the number of detected objects information "0" is sent from the electronic tablet 101 to the control computer 104 as input data.

For example, when there is only one input object on the coordinate input surface, from the electronic tablet 101 to the control computer 104, the detection time when the detection is performed, the number of detected objects information "1", and the data corresponding to the number of detected objects are sent. Data (packet data example 307 ) composed of coordinate information of an object and detected object size information is input as input data. In this example, the number of detected objects is "1", and it can be determined that the size of the input object is a small object whose size is not more than a specified threshold (for example, 10) based on the detected object size information. Therefore, it can be determined as 1-point input.

For example, when there are two input objects on the coordinate input surface, the electronic tablet 101 sends to the control computer 104 the detection time when the detection is performed, the number of detected objects information "2", and each data corresponding to the number of detected objects. Data (packet data example 308 ) composed of coordinate information of an object and detected object size information is input as input data. In this case, since the number of detected objects is "2", it can be determined that there are 2 inputs.

For example, when there is a palm on the coordinate input surface, from the electronic tablet 101 to the control computer 104, the detection time when the detection is performed, the number of detected objects information "1", and the coordinate information of the palm corresponding to the number of detected objects are sent. , The data (packet data example 309) composed of detected object size information is used as input data. In this case, the number of detected objects is "1", and it can be determined from the detected object size information that the size of the input object is larger than a specified threshold (for example, 10). Therefore, it may be decided to input for the palm.

(hand movement peculiar to the beginning of input)

FIG. 4 shows an example of a hand movement when an input is started with two fingers or a palm on the electronic tablet 101 .

As shown in symbol 401, when two fingers are intended to input on the electronic tablet, in most cases, the input is started from the state where the first finger touches the coordinate input surface, so that the second finger touches the coordinate input surface. In this case, the number of detected objects changes from the size of the input size of the number of detections P1 (input of one finger) to the size of the input size of the number of times of detection P2 (input of two fingers). In this way, input is performed while changing from one-finger input to two-finger input.

On the other hand, as indicated by reference numeral 402, when it is desired to input to the electronic tablet with the palm, in many cases, a part of the palm such as the tip of the finger touches the coordinate input surface to input. In this case, the number of detected objects changes from the input size of the detection count P'1 (one-finger input) to the input size of the detection count P'2 (palm input). In this way, input is performed while changing from one-finger input to palm input.

In either case, the input of 1 finger is performed first, and then the target input is started. Therefore, erroneous input may occur when input is judged at the stage of one-finger input. Therefore, it is possible to suppress erroneous input judgments (false events) by adopting a system in which no event is issued even if input information is accumulated from the start of input until a certain number of times of detection (for example, the number of times P2 or P'2) is accumulated.

(Speed at line input and drawing results based on existing methods)

FIG. 5 is a diagram showing the relationship between the detected coordinates when a line is drawn on the electronic tablet 101 using a finger or the like, and the line actually drawn by applying the above-mentioned suppression processing for erroneous input determination. As indicated by reference numeral 501, when a line is drawn slowly, the number of detected coordinates corresponding to one stroke is large. In the case of the symbol 501, it can be seen that ○ marks indicating detection coordinates are densely arranged. In this case, even if a certain amount of input information is not processed from the input, the drawn line does not greatly differ from the input line desired by the user. However, in the case of FIG. 5 , it can be seen that the three detection coordinates (shown by coloring) on the head side of the horizontal stroke and the three detection coordinates (shown by coloring) on the head side of the vertical stroke are not reflected in the drawing of the line. The length of each stroke actually drawn is shorter than the stroke at the time of input.

However, in the case of the example indicated by reference numeral 502 (when drawing a line quickly), the number of detected coordinates corresponding to one stroke decreases. In the case of the symbol 501, it can be seen that the ○ marks indicating the detection coordinates are sparsely arranged. In this case, as in the case of the symbol 501 , if a certain number of input information is not processed from the start of input, the drawn line is largely different from the user's intention. In the case of the symbol 502 , the three detection coordinates (shown by coloring) on the leading side of the horizontal stroke and the three detection coordinates (shown by coloring) on the leading side of the vertical stroke are not reflected in the drawing of the line either. As a result, a graph completely different from the input characters (graph) is drawn.

Especially when writing characters with a large number of strokes such as Chinese characters, short lines are often drawn quickly. Therefore, when a conventional algorithm is applied that does not reflect a certain number of detected coordinates from the start of a stroke in drawing in order to avoid misjudgment, the user may not be able to write the character desired by the user. Of course, when writing letters, the same problem occurs in the case of rapidly writing short segments.

From this, it can be seen that it is desirable not to execute the above-mentioned erroneous input suppression processing when drawing a line (especially a short line) quickly.

(Relationship between strokes when entering text by hand)

FIG. 6 shows the relationship between the input process time and the input standby time of each stroke when using the electronic tablet 101 to input characters by hand. As shown in FIG. 6, when the character "F" is input, the handwritten data consists of strokes a1, a2, and a3.

The input process time of each stroke is Ta1, Ta2, Ta3, and the input standby time is Ta12, Ta23. When strokes are continuously input like characters, the time interval from the end of the input of the previous stroke to the start of the input of the next stroke is short, and the faster the characters are written, the shorter the time interval tends to be. Therefore, when the time interval from the end of the input of the previous stroke to the start of the input of the next stroke is short, it can be estimated that a character is being input.

When drawing a line by 1-point input, 1-point input is continuously repeated. Therefore, it is less necessary to determine whether to shift from 1-point input to 2-point input or palm input in the erroneous input suppression process.

(The distribution of input points is different between click input and line input)

FIG. 7 shows the difference in distribution example of input points between click input and line input. As indicated by reference numeral 701, when the input is clicked, if the input start point is set as the origin, the coordinates in the X direction and the Y direction move very little until the input ends. That is, the input points are concentrated near the origin. On the other hand, as indicated by symbol 702, when a line is input, if the input start point is set as the origin, the coordinates of the input points move in the X direction or the Y direction until the input ends, and the input points are distributed at positions far from the origin. possibility rises. Therefore, when the input start point is used as a reference, it can be estimated that it is not a click input but a line input when the input has moved a certain distance or more before the input is completed.

(Modular structure of the wrong input prevention device)

FIG. 8 shows the functional block structure of the erroneous input prevention device realized as part of the functions of the display content control program 1041 stored in the internal memory of the control computer 104 . Of course, a circuit corresponding to the functional module structure may also be mounted on an electronic substrate or a semiconductor integrated circuit.

The erroneous input prevention device is composed of an input information analysis unit 801 , an execution function control unit 802 , and an input information storage unit 803 . The input information analysis unit 801 decomposes the input data 301 output from the electronic tablet 101 into detection time 302 , detected object number information 303 , coordinate information 304 , and detected object size information 305 .

Based on the extracted input information (decomposed information) and the history of the input information stored in the input information storage unit 803, the execution function control unit 802 generates a drawing of the operation screen presented to the user through the display device 106 or the operation screen projection device 103 information. In addition, the execution function control unit 802 executes a processing operation to store the newly extracted input information in the input information storage unit 803 as the latest history information. Details of processing operations executed by the execution function control unit 802 will be described later.

(Flowchart of the incorrect input prevention function)

FIG. 9 shows a flowchart corresponding to the operation of the erroneous input prevention processing executed as a function of the execution function control unit 802 . As described above, the processing functions of the execution function control unit 802 are executed as part of the functions of the program. Hereinafter, the processing of the execution function control unit 802 will be described.

When the execution function control unit 802 detects the start of input (that is, when the number of input objects changes from “0” to “1”), it acquires the input information provided from the input information analysis unit 801 (input object number information, coordinate information, input object size information) as information to be added to the input history (step 901 ).

Then, the execution function control unit 802 reads the state of the event release start flag that manages the flag state in step 910 described later from the data area, and determines whether the current state is starting event release (step 902 ). "Issuing an event" here means an operation to actually reflect the input information on the content of the operation screen.

When the execution function control unit 802 judges that the current status is "starting event release" (if the result is affirmative in step 902), it generates a release event of the input information acquired in step 901 as an event (step 903 ). Thereafter, the execution function control unit 802 issues an event to reflect the input information on the display content of the operation screen, and sets an event issuance start flag (step 910 ). Then, the execution function control unit 802 adds the input information to the history of the input information storage unit 803 (step 911 ). Thereafter, the execution function control unit 802 determines whether the input has been completed (step 912 ), and if the input has not been completed, returns to step 901 to acquire input start information again.

Next, a case where a negative result is obtained in step 902 will be described. When a negative result is obtained in step 902 (that is, when event issuance has not started), the execution function control unit 802 performs processing to determine whether the input information is handwriting input ( FIG. 6 ) (step 904 ). Specifically, it is determined whether or not the elapsed time from the previous input end time (upward operation detection time) to the current input start time (downward operation detection time) is within a predetermined time (step 904 ). Consider the input language (such as Japanese, English, etc.), the type of text (such as Chinese characters, hiragana, handwriting, font, etc.), the size of the text, and whether the user is an adult or a child, etc., to set the designation here time. However, it is desirable that the user can selectively set the designated time. When an adjustment function of usage time is installed, it is possible to further reduce erroneous input.

When it is determined that the elapsed time from the previous input end time to the current input start time is within the specified time, the execution function control unit 802 determines that lines are being drawn continuously, and generates a release event for the current input information (step 903 ). Thereby, when inputting the vertical stroke shown in FIG. 5, it is possible to prevent the input line from being missing at the beginning. Thereafter, the execution function control unit 802 issues an event to reflect the input information on the display content of the operation screen, and sets an event issuance start flag (step 910 ). Then, the execution function control unit 802 adds the input information to the history of the input information storage unit 803 (step 911 ). Thereafter, the execution function control unit 802 determines whether the input has not been completed (step 912 ), and if the input has not been completed, returns to step 901 to acquire input start information again.

Next, a case where a negative result is also obtained in step 904 will be described. This is the case where it is judged that the start of the input is more than a specified time from the end of the previous input. That is, it is a case where the execution function control unit 802 determines that the current input is not a continuous input as in the writing of characters. At this time, the execution function control unit 802 acquires input start information from the history information, and determines whether or not it is input information that has passed a predetermined time or more (step 905 ). If the specified time has elapsed, it is considered that the number of input objects or the size of the shadow has been determined, and a release event corresponding to each determination result is generated (step 903 ). Thereafter, the execution function control unit 802 issues an event to reflect the input information on the display content of the operation screen, and sets an event issuance start flag (step 910 ). Then, the execution function control unit 802 adds the input information to the history of the input information storage unit 803 (step 911 ). Thereafter, the execution function control unit 802 determines whether the input has not been completed (step 912 ), and if the input has not been completed, returns to step 901 to acquire input start information again.

Next, a case where a negative result is also obtained in step 905 will be described. In this case as well, it is an operation when it is determined that the start of the input is within the specified time from the end of the previous input. At this time, the execution function control unit 802 determines whether the input object number information is "0" (step 906 ).

When the input object number information is "0", the execution function control unit 802 selects the input method with the highest frequency in the history information (in the case of this embodiment, 1 finger or 2 fingers) in order to avoid misjudgment in initial input. , palm) to generate an issue event (step 907). Thereafter, the execution function control unit 802 issues an event to reflect the input information on the display content of the operation screen, and sets an event issuance start flag (step 910 ). Furthermore, the execution function control unit 802 adds the input information to the history of the input information storage unit 803 (step 911 ). Thereafter, the execution function control unit 802 judges whether the input has been completed, and if the input has not been completed, returns to step 901 and acquires input start information again.

Next, a case where a negative result is also obtained in step 906 will be described. In this case, it is determined that the input object number information is not "0". In this case, as shown in FIG. 7 , the execution function control unit 802 extracts the input start point from the history information in order to determine whether it is a click input or a line input, and determines whether the coordinates of the current input information have moved by a specified distance or more ( step 908). Also consider the input language (such as Japanese, English, etc.), the type of text (such as Chinese characters, hiragana, handwriting, font, etc.), the size of the text, and whether the user is an adult or a child, etc., to set the Specify the distance. Of course, it is desirable that the user can selectively set the specified distance. In the case where the adjustment function of the usage distance is installed, it is possible to further reduce mis-inputs.

When the input start point has moved beyond the specified distance, the execution function control unit 802 determines that the line is being drawn quickly, and generates a release event for the information of the input start point so that it can be reflected in the display content from the input start point (step 909). Thereby, when inputting the horizontal stroke shown in FIG. 5, it is possible to prevent the input line from being missing at the beginning of the stroke. Thereafter, the execution function control unit 802 issues an event to reflect the input information on the display content of the operation screen, and sets an event issuance start flag (step 910 ). Then, the execution function control unit 802 adds the input information to the history of the input information storage unit 803 (step 911 ). Thereafter, the execution function control unit 802 determines whether the input has not been completed (step 912 ), and if the input has not been completed, returns to step 901 to acquire input start information again.

When a negative result is also obtained in step 908 , the executed function control unit 802 adds input information to the history (step 911 ). Thereafter, the execution function control unit 802 judges whether the input has not been completed, and if the input has not been completed, returns to step 901 and acquires input start information again.

(other embodiments)

In the above-described embodiments, a case has been described in which an optical input device using the principle of triangulation is applied as a coordinate input device capable of simultaneously inputting a plurality of coordinates. However, in the present invention, the information related to the operation input detected using the coordinate input device is processed, and does not depend on the coordinate input method. Therefore, it can also be used to prevent erroneous input on devices that can detect multiple points at the same time (such as capacitive touch panels). Therefore, the coordinate input device according to the embodiment also includes a touch panel. In this case, the operation input surface of the coordinate input device coincides with the surface of the touch panel.

In addition, the coordinate input device according to the invention only needs to be able to detect at least simultaneous operation input for a plurality of coordinates, and may be an independent device or a device integrated with a display device (for example, a flat panel display). In addition, the coordinate input device according to the invention can also be applied to a tablet computer or a portable terminal.

In addition, the erroneous input preventing device according to the invention may be installed inside the coordinate input device, or may be installed in a device integrated with the coordinate input device. In addition, the erroneous input prevention device according to the present invention may be incorporated in other various devices that cooperate with the coordinate input device.

Explanation of symbols

101 electronic tablet

102 input pen

103 Operation screen projection device

104 Control computer

105 keyboard

106 display device

107 input area

1041 display handler

301 input data

302 detection time

303 Number of detected objects

304 coordinate information

305 Detect object size information

801 Input Information Analysis Department

802 Executive Function Control Unit

803 input information storage unit

Claims (4)

1. coordinate entering device can detect step-down operation and the last lift operations of input object to the operation input face, and operation input when can detect a plurality of coordinate, it is characterized in that, comprising:

Detect and the operation input relevant information processing unit of input object the operation screen of demonstration or projection;

Calculating is from the previous processing unit of lift operations to the elapsed time of new step-down operation of going up; And

When the elapsed time that calculates when threshold value is following, at the processing unit of the incident of the detection coordinates of step-down operation distribution input information.

2. a coordinate entering device is operated input when can detect a plurality of coordinate, it is characterized in that, comprising:

Detect the processing unit of input object to the coordinate of the operation input of the operation screen of demonstration or projection;

With the data group of detected coordinate as the processing unit of object data stores in storage area;

Coordinate when calculating begins from importing is to the processing unit of the displacement of current coordinate; And

When the displacement that calculates when threshold value is above, at the processing unit of the incident of the coordinate distribution input starting point in when beginning input.

3. program; It is characterized in that; Be used to make from can detecting step-down operation and the last lift operations of input object, and the coordinate entering device input of operation input when can detect a plurality of coordinate and input object are to showing or the computing machine of the information that the operation input of the operation screen of projection is relevant is carried out following processing to the operation input face:

The processing of calculating from previous last lift operations to the elapsed time of new step-down operation; And

When the elapsed time that calculates when threshold value is following, in the processing of the incident of the detection coordinates of step-down operation distribution input information.

4. a program is characterized in that, the coordinate entering device input input object that is used to make operation input when can detect to a plurality of coordinate to show or the Coordinate Calculation machine of the operation input of the operation screen of projection carry out below processing:

With the data group of detected coordinate as the processing of object data stores in storage area;

Coordinate when calculating begins from importing is to the processing of the displacement of current coordinate; And

When the displacement that calculates when threshold value is above, in the processing of the incident of the coordinate distribution input starting point in when beginning input.

Images